[Feature Request]: add support for linux iio (Industrial I/O) subsystem for sensors

[Jorropo]

Platform

Linux Native

Description

Linux iio provide many drivers for different kind of sensors:
https://www.kernel.org/doc/html/latest/driver-api/iio/intro.html

• analog to digital converters (ADCs)
• accelerometers
• capacitance to digital converters (CDCs)
• digital to analog converters (DACs)
• gyroscopes
• inertial measurement units (IMUs)
• color and light sensors
• magnetometers
• pressure sensors
• proximity sensors
• temperature sensors

It would be nice if sensors that are already supported in meshtastic (pressure, temperature, ...) could fetch data through /sys/bus/iio so any pressure or temperature sensor with a linux driver would be usable in meshtastic.

[jp-bennett]

@Jorropo have a suggested affordable sensor to start with?

[Jorropo]

There a couple sensors supported by mesthastic already would allow to confirm the feature work properly.
BMP and BME family are the one that come to my mind. https://github.com/torvalds/linux/blob/master/drivers/iio/pressure/bmp280-spi.c#L120-L141

[rexbyrns]

1-wire is very rich.... I2C to 1-wire bridges are cool..

[thebentern]

As much as I love the Dallas 1-wire sensors and use them a lot in other projects, we removed support for those in Meshtastic in favor of a rich i2c ecosystem of sensors where we have a clearly defined bus and don't have to add yet-another-gpio pin for a user to hunt down in potentially problematic boards. If you can get i2c to 1-wire bridges going, that would be a welcome addition :-)